@boogiewoogies: Can you offer a reference? Now I’m interested. It looks like “Grammer Girl” doesn’t like “and.” But, from what I can tell, it looks like it differs depending on the use of American vs. British English?

@aliavenue: I tried to look up an example for you, but couldn’t find one. I guess I can only tell you from my own personal experience: I graduated HS in 2007 and on the spine of the yearbook it was written out “two thousand and seven”…my AP English Lit teacher gave us a long lecture about not including the “and” and was really disappointed in the yearbook staff because a couple of the kids were actually in the same AP class as me. I’m not perfect with the English language but that stuck with me. That’s all I got, sorry.

For invitations, you can use ‘and’ to make the date flow better, but it isn’t actually mathematically correct and indicates a decimal. I don’t think anyone will notice though so you can just pick whichever one you like best.